Mercurial > hg > truffle
annotate src/share/vm/services/classLoadingService.cpp @ 1147:75bd253e25dd
6637203: Classunloading messages go to stdout rather than Xloggc file, causing hangs when stdout is closed
Summary: Decoupled TraceClassUnloading from verbose:gc, JVMTI_VERBOSE_GC and PrintGC[Details], making it settable in a manner identical to TraceClassLoading. Reverted an inadvertent change of TraceClassUnloading output in a previous changeset from gclog back to tty.
Reviewed-by: coleenp, dholmes, jmasa, poonam
| author | ysr |
|---|---|
| date | Mon, 04 Jan 2010 14:51:26 -0800 |
| parents | e018e6884bd8 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_classLoadingService.cpp.incl" | |
| 27 | |
| 28 #ifdef DTRACE_ENABLED | |
| 29 | |
| 30 // Only bother with this argument setup if dtrace is available | |
| 31 | |
| 32 HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool); | |
| 33 HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool); | |
| 34 | |
| 35 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ | |
| 36 { \ | |
| 37 char* data = NULL; \ | |
| 38 int len = 0; \ | |
| 39 symbolOop name = (clss)->name(); \ | |
| 40 if (name != NULL) { \ | |
| 41 data = (char*)name->bytes(); \ | |
| 42 len = name->utf8_length(); \ | |
| 43 } \ | |
| 44 HS_DTRACE_PROBE4(hotspot, class__##type, \ | |
| 45 data, len, (clss)->class_loader(), (shared)); \ | |
| 46 } | |
| 47 | |
| 48 #else // ndef DTRACE_ENABLED | |
| 49 | |
| 50 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) | |
| 51 | |
| 52 #endif | |
| 53 | |
| 54 // counters for classes loaded from class files | |
| 55 PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; | |
| 56 PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; | |
| 57 PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; | |
| 58 PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; | |
| 59 | |
| 60 // counters for classes loaded from shared archive | |
| 61 PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; | |
| 62 PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; | |
| 63 PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; | |
| 64 PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; | |
| 65 PerfVariable* ClassLoadingService::_class_methods_size = NULL; | |
| 66 | |
| 67 void ClassLoadingService::init() { | |
| 68 EXCEPTION_MARK; | |
| 69 | |
| 70 // These counters are for java.lang.management API support. | |
| 71 // They are created even if -XX:-UsePerfData is set and in | |
| 72 // that case, they will be allocated on C heap. | |
| 73 _classes_loaded_count = | |
| 74 PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", | |
| 75 PerfData::U_Events, CHECK); | |
| 76 | |
| 77 _classes_unloaded_count = | |
| 78 PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", | |
| 79 PerfData::U_Events, CHECK); | |
| 80 | |
| 81 _shared_classes_loaded_count = | |
| 82 PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", | |
| 83 PerfData::U_Events, CHECK); | |
| 84 | |
| 85 _shared_classes_unloaded_count = | |
| 86 PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", | |
| 87 PerfData::U_Events, CHECK); | |
| 88 | |
| 89 if (UsePerfData) { | |
| 90 _classbytes_loaded = | |
| 91 PerfDataManager::create_counter(SUN_CLS, "loadedBytes", | |
| 92 PerfData::U_Bytes, CHECK); | |
| 93 | |
| 94 _classbytes_unloaded = | |
| 95 PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", | |
| 96 PerfData::U_Bytes, CHECK); | |
| 97 _shared_classbytes_loaded = | |
| 98 PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", | |
| 99 PerfData::U_Bytes, CHECK); | |
| 100 | |
| 101 _shared_classbytes_unloaded = | |
| 102 PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", | |
| 103 PerfData::U_Bytes, CHECK); | |
| 104 _class_methods_size = | |
| 105 PerfDataManager::create_variable(SUN_CLS, "methodBytes", | |
| 106 PerfData::U_Bytes, CHECK); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 void ClassLoadingService::notify_class_unloaded(instanceKlass* k) { | |
| 111 DTRACE_CLASSLOAD_PROBE(unloaded, k, false); | |
| 112 // Classes that can be unloaded must be non-shared | |
| 113 _classes_unloaded_count->inc(); | |
| 114 | |
| 115 if (UsePerfData) { | |
| 116 // add the class size | |
| 117 size_t size = compute_class_size(k); | |
| 118 _classbytes_unloaded->inc(size); | |
| 119 | |
| 120 // Compute method size & subtract from running total. | |
| 121 // We are called during phase 1 of mark sweep, so it's | |
| 122 // still ok to iterate through methodOops here. | |
| 123 objArrayOop methods = k->methods(); | |
| 124 for (int i = 0; i < methods->length(); i++) { | |
| 125 _class_methods_size->inc(-methods->obj_at(i)->size()); | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 if (TraceClassUnloading) { | |
| 130 ResourceMark rm; | |
|
1147
75bd253e25dd
6637203: Classunloading messages go to stdout rather than Xloggc file, causing hangs when stdout is closed
ysr
parents:
1145
diff
changeset
|
131 tty->print_cr("[Unloading class %s]", k->external_name()); |
| 0 | 132 } |
| 133 } | |
| 134 | |
| 135 void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) { | |
| 136 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); | |
| 137 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count | |
| 138 : _classes_loaded_count); | |
| 139 // increment the count | |
| 140 classes_counter->inc(); | |
| 141 | |
| 142 if (UsePerfData) { | |
| 143 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded | |
| 144 : _classbytes_loaded); | |
| 145 // add the class size | |
| 146 size_t size = compute_class_size(k); | |
| 147 classbytes_counter->inc(size); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 size_t ClassLoadingService::compute_class_size(instanceKlass* k) { | |
| 152 // lifted from ClassStatistics.do_class(klassOop k) | |
| 153 | |
| 154 size_t class_size = 0; | |
| 155 | |
| 156 class_size += k->as_klassOop()->size(); | |
| 157 | |
| 158 if (k->oop_is_instance()) { | |
| 159 class_size += k->methods()->size(); | |
| 160 class_size += k->constants()->size(); | |
| 161 class_size += k->local_interfaces()->size(); | |
| 162 class_size += k->transitive_interfaces()->size(); | |
| 163 // We do not have to count implementors, since we only store one! | |
| 164 class_size += k->fields()->size(); | |
| 165 } | |
| 166 return class_size * oopSize; | |
| 167 } | |
| 168 | |
| 169 | |
| 170 bool ClassLoadingService::set_verbose(bool verbose) { | |
| 171 MutexLocker m(Management_lock); | |
| 172 | |
| 173 // verbose will be set to the previous value | |
| 174 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT); | |
| 175 assert(succeed, "Setting TraceClassLoading flag fails"); | |
| 176 reset_trace_class_unloading(); | |
| 177 | |
| 178 return verbose; | |
| 179 } | |
| 180 | |
| 181 // Caller to this function must own Management_lock | |
| 182 void ClassLoadingService::reset_trace_class_unloading() { | |
| 183 assert(Management_lock->owned_by_self(), "Must own the Management_lock"); | |
| 184 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); | |
| 185 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT); | |
| 186 assert(succeed, "Setting TraceClassUnLoading flag fails"); | |
| 187 } | |
| 188 | |
| 189 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; | |
| 190 Thread* LoadedClassesEnumerator::_current_thread = NULL; | |
| 191 | |
| 192 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { | |
| 193 assert(cur_thread == Thread::current(), "Check current thread"); | |
| 194 | |
| 195 int init_size = ClassLoadingService::loaded_class_count(); | |
| 196 _klass_handle_array = new GrowableArray<KlassHandle>(init_size); | |
| 197 | |
| 198 // For consistency of the loaded classes, grab the SystemDictionary lock | |
| 199 MutexLocker sd_mutex(SystemDictionary_lock); | |
| 200 | |
| 201 // Set _loaded_classes and _current_thread and begin enumerating all classes. | |
| 202 // Only one thread will do the enumeration at a time. | |
| 203 // These static variables are needed and they are used by the static method | |
| 204 // add_loaded_class called from classes_do(). | |
| 205 _loaded_classes = _klass_handle_array; | |
| 206 _current_thread = cur_thread; | |
| 207 | |
| 208 SystemDictionary::classes_do(&add_loaded_class); | |
| 209 | |
| 210 // FIXME: Exclude array klasses for now | |
| 211 // Universe::basic_type_classes_do(&add_loaded_class); | |
| 212 } |